(E)-2-methyl-3-oxo-5-phenyl-2,3-dihydro-1H-pyrazole-4-carbaldehyde O-(2,4-dichlorobenzyl) oxime CAS 321533-58-8
| CAS No. | 321533-58-8 |
| Molecular Formula | C18H15Cl2N3O2 |
| Molecular Weight | 376.24 g/mol |
| Category | Pharmaceutical Standards / API Standards |
| Availability | In Stock |
Chemical Structure
Description
Compared with other compounds in its class, the molecular weight of 376.24 g/mol gives (E)-2-methyl-3-oxo-5-phenyl-2,3-dihydro-1H-pyrazole-4-carbaldehyde O-(2,4-dichlorobenzyl) oxime distinctive chromatographic separation conditions and mass-spectrometry parameter settings.
(E)-2-methyl-3-oxo-5-phenyl-2,3-dihydro-1H-pyrazole-4-carbaldehyde O-(2,4-dichlorobenzyl) oxime (CAS 321533-58-8) is a high-purity analytical reference standard with the molecular formula C18H15Cl2N3O2 and a molecular weight of 376.24 g/mol.
Structurally, (E)-2-methyl-3-oxo-5-phenyl-2,3-dihydro-1H-pyrazole-4-carbaldehyde O-(2,4-dichlorobenzyl) oxime (C18H15Cl2N3O2) contains a steroid core, an amide group, a hydroxyl group, an ether linkage, chlorine substitution. The molecule exhibits a degree of unsaturation (DBE) of 12.0, corresponding to approximately 12 ring(s) or double-bond equivalent(s). With a molecular weight of 376.24 g/mol, it falls into the moderately-high-molecular-weight range. The aromatic system may exhibit native fluorescence, enabling detection with a fluorescence detector (FLD).
Recommended for analytical method development and validation; each product is supplied with a full Certificate of Analysis (COA) ensuring ISO 17034 metrological traceability.
The assigned purity is verified by mass-balance and quantitative NMR (qNMR) approaches, with the expanded uncertainty reported at a 95% confidence level (k=2). Batch homogeneity and stability are independently assessed for every lot.
Physical & Chemical Properties
| Molecular Formula | C18H15Cl2N3O2 |
| Molecular Weight | 376.24 g/mol |
| Appearance | Pale yellow to yellow crystalline powder. (slight halide-like odor, low volatility) |
| Purity | 97%+ |
| Storage | Store at 2-8°C, protect from light, keep sealed and dry |
| Solubility (reference) | Soluble in DMSO, DMF, methanol |
| Stability | May oxidize slowly on prolonged air exposure; Light-sensitive; avoid direct strong light; Hygroscopic; reseal immediately after opening; Contains ester bond; hydrolyzes under strong alkaline conditions |
| Degree of Unsaturation (DBE) | 12.0 |
| UV Absorption | UV-absorbing |
| Structural Features | Aromatic ring present |
| CAS Registry Year (est.) | 2025 |
| Halogen Content | Cl-containing |
| Nitrogen Atoms | 3 |
Recommended Standards
- (5-Chloro-1-methyl-3-phenyl-1H-pyrazol-4-yl)methyl (4-chlorophenyl)carbamate (CAS 318248-37-2)
- 2-((3-Bromophenyl)amino)-2-oxoethyl 2-phenylbutanoate (CAS 380171-00-6)
- (4Z)-1-(4-Chlorophenyl)-4-{[(4-chlorophenyl)amino]methylidene}-3-ethoxy-4,5-dihydro-1H-pyrazol-5-one (CAS 338751-06-7)
- 2-(6,8-Dichloro-4-oxoquinazolin-3(4H)-yl)-N-ethyl-N-phenylacetamide (CAS 618443-81-5)
- 4-Bromo-2-(difluoromethoxy)thiophenol (CAS 1805024-30-9)
- 3-Bromo-N,N-dimethyl-5-(trifluoromethyl)pyridin-2-amine (CAS 216765-95-6)
- 3-Hydroxy-4-(4-methoxybenzoyl)-1-(5-methyl-1,3,4-thiadiazol-2-yl)-5-phenyl-1H-pyrrol-2(5H)-one (CAS 609794-11-8)
- 6-Methoxy-1H-pyrrolo[3,2-b]pyridine-2-carboxylic acid (CAS 1260382-28-2)
- 3-((1H-1,2,4-triazol-5-yl)amino)-5,5-dimethylcyclohex-2-en-1-one (CAS 696657-58-6)
- 2',4'-Dichloro-3-fluoro-[1,1'-biphenyl]-4-carboxylic acid (CAS 1261981-25-2)
- 3-Chloro-N-[2-(1H-indol-3-yl)ethyl]-2,2-dimethylpropanamide (CAS 477890-36-1)
- 1-(2,2-Difluoropropyl)-3-fluorobenzene (CAS 62558-07-0)
- (R)-4-(4-(Aminomethyl)benzyl)oxazolidin-2-one (CAS 1217732-05-2)
- Palmitoyl Tetrapeptide-7 (CAS 221227-05-0)
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